You'll have to fight in a blizzard in the new Destiny expansion, called "Rise of Iron," coming in September.Bungie

For those unfamiliar, "Destiny" is made by Bungie, the creators of the ultra-popular Halo franchise. It's an addictive first-person shooter where you and your friends fight militarized aliens in space for hours and hours on your way towards getting better gear and guns.

Next month marks the official beginning of what Bungie and its fans call "Year 3" of "Destiny," which is highlighted by the newest expansion to the game, called "Rise of Iron," coming September 20. It will cost $30, and it will only be available for PlayStation 4 and Xbox One consoles.

Everything you need to know about "Rise of Iron" you can get from a brand new 8-minute video documentary Bungie released on Tuesday in honor of Gamescom, the giant gaming convention happening in Germany right now. It offered a ton of details and images about this new expansion, which looks really impressive.

"Destiny" players might know Lord Saladin, the guy who gives you bounties during those monthly tournaments known as "The Iron Banner."

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The "Rise of Iron" expansion promises a rich backstory for Lord Saladin and his comrades known as the Iron Lords.

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In unraveling the history of the Iron Lords, you will need to overcome an ancient plague and become an Iron Lord yourself.

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Bungie has created an all-new area for this expansion called "The Plaguelands," an area of Old Russia that's been quarantined for centuries.

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The Plaguelands are also home to a technology with almost limitless power, called SIVA.

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In "Rise of Iron," the alien race known as Fallen has discovered SIVA and decided to use it as a weapon.

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It's up to you to stop them.

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Thankfully, you'll be getting a ton of new gear to tackle this new threat.

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Seriously, some pretty nice gear is to be had here.

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There's also new "exotic" weapons and armor, which are extremely rare items in the game that usually require some particularly difficult feat be done.

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Some armor and weapons even come with a new option called "ornaments," which essentially can give you some really cool-looking paint jobs.

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Some of the new activities in "Rise of Iron" look really fun. There's a new strike activity — basically, a cooperative mission that requires you and two other players — that culminates in a rich boss encounter with a Fallen captain using an ogre's eye to shoot laser beams at you while the blind ogre walks around trying to crush you.

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There's also a new public activity area where you and a group of random people on the internet can wail on boss-like enemies in what's called the Archon's Forge.

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And finally, there's an awesome-sounding new raid called "Wrath of the Machine." Raids in "Destiny" are intricate activities that requires six people, lots of coordination and lots of time, but reward some of the best loot in the game.

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Oh, and get ready for more of those beautiful cut-scenes.

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Those sweet, sweet cut-scenes.

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There's a ton of other new features in "Rise of Iron," but this new video documentary from Bungie does a much better job at explaining all of them and creating excitement. Definitely worth a watch.

"Rise of Iron" will release on September 20 for PS4 and Xbox One consoles.